If you are ARMY (a BTS fan), you probably know the common structure of a BTS concert, and you probably know about the last-song lie. This lie has been told at BTS concerts since at least 2015. Here’s what happens. About two hours in, one of the guys, usually RM, announces that “this is the last song.” But really, it’s only the last song before a short break, after which they always return for their encore set—to nobody’s surprise. When RM makes this last song announcement, there is still about another hour’s worth of concert to go, and the audience knows it.

Why has saying something technically untrue become such a reliable feature of BTS’ concerts? Because BTS are masters of something extremely difficult: ending well. They put a great deal of thought into how they end their shows, and they do so because they care about their fans—and themselves—not only in those key emotional moments, but in all other moments too.